[U-16] The 2024 Noto Peninsula Earthquake (2:E)

[U16-04] Structural characters of nearshore active faults in the eastern Sea of Japan

★Invited Papers

*Tatsuya Ishiyama¹, Hiroshi Sato^1,3, Tetsuo No² (1.Earthquake Research Institute, University of Tokyo, 2. Research Institute for Marine Geodynamics, Japan Agency for Marine-Earth Science and Technology, 3.Center for Integrated Research and Education of Natural Hazards, Shizuoka University)

The 2024 Noto Peninsula earthquake (M7.6) indicated that nearshore active faults have the potential to cause simultaneous intense ground motion, tsunamis, significant liquefactions, and earthquake-induced landslides. We demonstrate the structural characters and origins of nearshore and offshore active faults in the eastern Sea of Japan, including off the Noto Peninsula and Toyama trough, mostly based on onshore, offshore and onshore-offshore seismic profilings and geologic structures. These datasets support our view that rift-related structures created during the Miocene opening of the Sea of Japan have played the most significant roles in current tectonics in this region, as well as structural and mechanical heterogeneities within the upper and lower crust. As indicators of coseismic uplift, timing of repeated paleoearthquakes, and uplift rates in the intermediate (~10⁵ yrs) timescales, we also address potential linkages between coastal landforms such as marine terraces and the activities of nearshore active faults.